well,
they call it "4x4x4". means, 4wheel drive, 4 wheel steer, 4 equal size wheels.
0-
Normally all machines built with 4 equal sized wheels!
1- This helps to get almost
perfect stability.
2- Also Small front wheels can not handle weight over 3-3,5 tonnes. There fore these
big front wheels last longer than small ones.
3- Traditional backhoes', back wheels speed never equals to small front wheels. Equal wheels turn with equal speed. Therefore these
big front wheels last longer than small ones.
4- 4 wheel steering machines can make parallel parking in narrow areas without manouevre. This helps you
works safer and faster
5- While using the loader, small front wheels does not contact with ground perfectly. On 4x4x4 machines, if front wheels' contact get lost, back steering wheels help to turn machine. this
proves perfect control.
Hmmh, I dont know the worth of this option (4x4x4). But JCB offers this for an extra 10.000 € in europe.
Ok it's technically perfect but sooo expensive.